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<td nowrap="true" class="pageTitle">核对表：数据模型</td><td width="100%">
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<td valign="top">此核对表有助于确保数据模型是正确且完整的。</td>
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<div class="sectionHeading">关系</div>
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<th scope="row" class="sectionTableHeading">相关元素</th><td class="sectionTableCell">
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<a href="./../../../core.base_rup/tasks/database_design_8552DD3.html" guid="{2E74A414-49F5-4F27-BFCB-AA2DAC675F58}">数据库设计</a>
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<a href="./../../../core.base_rup/workproducts/rup_data_model_65B46980.html" guid="{9DCF1723-1A21-4F48-BEDE-DBC543489682}">数据模型</a>
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<div class="sectionHeading">主要描述</div>
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<td class="sectionTableSingleCell"><a id="XE_data_model__checkpoints" name="XE_data_model__checkpoints" class="index" key="数据模型（data model）" text="检查点"></a><br />
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<div class="sectionHeading">检查项</div>
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<div class="stepHeading"> 使用数据库来实现持久性的所有持久类已映射到数据库结构</div>
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<div class="stepHeading"> 多对多的关系有一个交叉表</div>
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<div class="stepHeading"> 除非由于性能原因，否则已为每个表定义了主键</div>
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<div class="stepHeading"> 已优化了数据的存储和检索</div>
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    如果使用的是关系数据库，则已对表进行了取消范式化（必要时）以改进性能。
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    当使用取消范式化时，考虑到了所有更新、插入和删除的情况，以确保取消范式化不会降低那些操作的性能。
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<div class="stepHeading"> 定义了索引，以优化访问</div>
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<div class="stepHeading"> 在其他表操作中考虑到了索引更新的影响</div>
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<div class="stepHeading"> 规划了数据的分发</div>
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<div class="stepHeading"> 定义了数据和引用完整性约束</div>
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<div class="stepHeading"> 当数据规则有变更时，可使用计划来维护验证约束</div>
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<div class="stepHeading"> 定义了存储过程和触发器</div>
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<div class="stepHeading"> 持久性机制都使用存储过程和数据库触发器</div>
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